基于OpenHarmony 系统通过S7协议读取西门子PLC数据

#include <stdio.h>
#include <stdlib.h>
#include "snap7/snap7.h"
#include "snap7/client.h"
#include "hilog/log.h"

#ifdef OS_WINDOWS
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#endif

     TS7Client *Client;

	 byte Buffer[65536]; // 64 K buffer
     int SampleDBNum = 1000;

     char *Address = "10.168.100.2";     // PLC IP Address
     int Rack = 0,Slot = 1; // Default Rack and Slot

     int ok = 0; // Number of test pass
     int ko = 0; // Number of test failure

     bool JobDone=false;
     int JobResult=0;

//------------------------------------------------------------------------------
//  Async completion callback 
//------------------------------------------------------------------------------
// This is a simply text demo, we use callback only to set an internal flag...
void S7API CliCompletion(void *usrPtr, int opCode, int opResult)
{
    JobResult=opResult;
    JobDone = true;
}
//------------------------------------------------------------------------------
// SysSleep (copied from snap_sysutils.cpp) multiplatform millisec sleep
//------------------------------------------------------------------------------
void SysSleep(longword Delay_ms)
{
#ifdef OS_WINDOWS
    Sleep(Delay_ms);
#else
    struct timespec ts;
    ts.tv_sec = (time_t)(Delay_ms / 1000);
    ts.tv_nsec =(long)((Delay_ms - ts.tv_sec) * 1000000);
    nanosleep(&ts, (struct timespec *)0);
#endif
}
//------------------------------------------------------------------------------
//  Usage Syntax
//------------------------------------------------------------------------------
void Usage()
{
    printf("Usage\n");
    printf("  client <IP> [Rack=0 Slot=2]\n");
    printf("Example\n");
    printf("  client 192.168.1.101 0 2\n");
    printf("or\n");
    printf("  client 192.168.1.101\n");
    getchar();
}
//------------------------------------------------------------------------------
// hexdump, a very nice function, it's not mine.
// I found it on the net somewhere some time ago... thanks to the author ;-)
//------------------------------------------------------------------------------
#ifndef HEXDUMP_COLS
#define HEXDUMP_COLS 16
#endif
void hexdump(void *mem, unsigned int len)
{
        unsigned int i, j;

        for(i = 0; i < len + ((len % HEXDUMP_COLS) ? (HEXDUMP_COLS - len % HEXDUMP_COLS) : 0); i++)
        {
                /* print offset */
                if(i % HEXDUMP_COLS == 0)
                {
                        printf("0x%04x: ", i);
                }

                /* print hex data */
                if(i < len)
                {
                        printf("%02x ", 0xFF & ((char*)mem)[i]);
                }
                else /* end of block, just aligning for ASCII dump */
                {
                        printf("   ");
                }

                /* print ASCII dump */
                if(i % HEXDUMP_COLS == (HEXDUMP_COLS - 1))
                {
                        for(j = i - (HEXDUMP_COLS - 1); j <= i; j++)
                        {
                                if(j >= len) /* end of block, not really printing */
                                {
                                        putchar(' ');
                                }
                                else if(isprint((((char*)mem)[j] & 0x7F))) /* printable char */
                                {
                                        putchar(0xFF & ((char*)mem)[j]);
                                }
                                else /* other char */
                                {
                                        putchar('.');
                                }
                        }
                        putchar('\n');
                }
        }
}
//------------------------------------------------------------------------------
// Check error
//------------------------------------------------------------------------------
bool Check(int Result, const char * function)
{
    printf("\n");
    printf("+-----------------------------------------------------\n");
    printf("| %s\n",function);
    printf("+-----------------------------------------------------\n");
    if (Result==0) {
        printf("| Result         : OK\n");
        printf("| Execution time : %d ms\n",Client->ExecTime());
        printf("+-----------------------------------------------------\n");
        ok++;
    }
    else {
        printf("| ERROR !!! \n");
        if (Result<0)
            printf("| Library Error (-1)\n");
        else
            printf("| %s\n",CliErrorText(Result).c_str());
        printf("+-----------------------------------------------------\n");
        ko++;
    }
    return Result==0;
}
//------------------------------------------------------------------------------
// Multi Read
//------------------------------------------------------------------------------
void MultiRead()
{
     // Multiread buffers
     byte MB[16]; // 16 Merker bytes
     byte EB[16]; // 16 Digital Input bytes
     byte AB[16]; // 16 Digital Output bytes
     word TM[8];  // 8 timers
     word CT[8];  // 8 counters

     // Prepare struct
     TS7DataItem Items[5];

     // NOTE : *AMOUNT IS NOT SIZE* , it's the number of items

     // Merkers
     Items[0].Area     =S7AreaMK;
     Items[0].WordLen  =S7WLByte;
     Items[0].DBNumber =0;        // Don't need DB
     Items[0].Start    =0;        // Starting from 0
     Items[0].Amount   =16;       // 16 Items (bytes)
     Items[0].pdata    =&MB;
     // Digital Input bytes
     Items[1].Area     =S7AreaPE;
     Items[1].WordLen  =S7WLByte;
     Items[1].DBNumber =0;        // Don't need DB
     Items[1].Start    =0;        // Starting from 0
     Items[1].Amount   =16;       // 16 Items (bytes)
     Items[1].pdata    =&EB;
     // Digital Output bytes
     Items[2].Area     =S7AreaPA;
     Items[2].WordLen  =S7WLByte;
     Items[2].DBNumber =0;        // Don't need DB
     Items[2].Start    =0;        // Starting from 0
     Items[2].Amount   =16;       // 16 Items (bytes)
     Items[2].pdata    =&AB;
     // Timers
     Items[3].Area     =S7AreaTM;
     Items[3].WordLen  =S7WLTimer;
     Items[3].DBNumber =0;        // Don't need DB
     Items[3].Start    =0;        // Starting from 0
     Items[3].Amount   =8;        // 8 Timers
     Items[3].pdata    =&TM;
     // Counters
     Items[4].Area     =S7AreaCT;
     Items[4].WordLen  =S7WLCounter;
     Items[4].DBNumber =0;        // Don't need DB
     Items[4].Start    =0;        // Starting from 0
     Items[4].Amount   =8;        // 8 Counters
     Items[4].pdata    =&CT;

     int res=Client->ReadMultiVars(&Items[0],5);
     if (Check(res,"Multiread Vars"))
     {
        // Result of Client->ReadMultivars is the "global result" of
        // the function, it's OK if something was exchanged.

        // But we need to check single Var results.
        // Let shall suppose that we ask for 5 vars, 4 of them are ok but
        // the 5th is inexistent, we will have 4 results ok and 1 not ok.

        printf("Dump MB0..MB15 - Var Result : %d\n",Items[0].Result);
        if (Items[0].Result==0)
            hexdump(&MB,16);
        printf("Dump EB0..EB15 - Var Result : %d\n",Items[1].Result);
        if (Items[1].Result==0)
            hexdump(&EB,16);
        printf("Dump AB0..AB15 - Var Result : %d\n",Items[2].Result);
        if (Items[2].Result==0)
            hexdump(&AB,16);
        printf("Dump T0..T7 - Var Result : %d\n",Items[3].Result);
        if (Items[3].Result==0)
            hexdump(&TM,16);         // 8 Timers -> 16 bytes
        printf("Dump Z0..Z7 - Var Result : %d\n",Items[4].Result);
        if (Items[4].Result==0)
            hexdump(&CT,16);         // 8 Counters -> 16 bytes
     };
}
//------------------------------------------------------------------------------
// List blocks in AG
//------------------------------------------------------------------------------
void ListBlocks()
{
    TS7BlocksList List;
    int res=Client->ListBlocks(&List);
    if (Check(res,"List Blocks in AG"))
    {
        printf("  OBCount  : %d\n",List.OBCount);
	    printf("  FBCount  : %d\n",List.FBCount);
   		printf("  FCCount  : %d\n",List.FCCount);
   		printf("  SFBCount : %d\n",List.SFBCount);
   		printf("  SFCCount : %d\n",List.SFCCount);
   		printf("  DBCount  : %d\n",List.DBCount);
   		printf("  SDBCount : %d\n",List.SDBCount);
    };
}
//------------------------------------------------------------------------------
// CPU Info : catalog
//------------------------------------------------------------------------------
void OrderCode()
{
     TS7OrderCode Info;
     int res=Client->GetOrderCode(&Info);
     if (Check(res,"Catalog"))
     {
          printf("  Order Code : %s\n",Info.Code);
          printf("  Version    : %d.%d.%d\n",Info.V1,Info.V2,Info.V3);
     };
}
//------------------------------------------------------------------------------
// CPU Info : unit info
//------------------------------------------------------------------------------
void CpuInfo()
{
     TS7CpuInfo Info;
     int res=Client->GetCpuInfo(&Info);
     if (Check(res,"Unit Info"))
     {
          printf("  Module Type Name : %s\n",Info.ModuleTypeName);
          printf("  Serial Number    : %s\n",Info.SerialNumber);
          printf("  AS Name          : %s\n",Info.ASName);
          printf("  Module Name      : %s\n",Info.ModuleName);
     };
}
//------------------------------------------------------------------------------
// CP Info
//------------------------------------------------------------------------------
void CpInfo()
{
     TS7CpInfo Info;
     int res=Client->GetCpInfo(&Info);
     if (Check(res,"Communication processor Info"))
     {
          printf("  Max PDU Length   : %d bytes\n",Info.MaxPduLengt);
          printf("  Max Connections  : %d \n",Info.MaxConnections);
          printf("  Max MPI Rate     : %d bps\n",Info.MaxMpiRate);
          printf("  Max Bus Rate     : %d bps\n",Info.MaxBusRate);
     };
}
//------------------------------------------------------------------------------
// PLC Status
//------------------------------------------------------------------------------
void UnitStatus()
{
     int res=0;
     int Status=Client->PlcStatus();
     if (Check(res,"CPU Status"))
     {
          switch (Status)
          {
              case S7CpuStatusRun : printf("  RUN\n"); break;
              case S7CpuStatusStop: printf("  STOP\n"); break;
              default             : printf("  UNKNOWN\n"); break;
          }
     };
}
//------------------------------------------------------------------------------
// Upload DB0 (surely exists in AG)
//------------------------------------------------------------------------------
void UploadDB0()
{
     int Size = sizeof(Buffer); // Size is IN/OUT par
                                // In input it tells the client the size available
                                // In output it tells us how many bytes were uploaded.
     int res=Client->Upload(Block_SDB, 0, &Buffer, &Size);
     if (Check(res,"Block Upload (SDB 0)"))
     {
          printf("Dump (%d bytes) :\n",Size);
          hexdump(&Buffer,Size);
     }
}
//------------------------------------------------------------------------------
// Async Upload DB0 (using callback as completion trigger)
//------------------------------------------------------------------------------
void AsCBUploadDB0()
{
     int Size = sizeof(Buffer); // Size is IN/OUT par
                                // In input it tells the client the size available
                                // In output it tells us how many bytes were uploaded.
     JobDone=false;
     int res=Client->AsUpload(Block_SDB, 0, &Buffer, &Size);
     
     if (res==0)
     {
         while (!JobDone)
         {
             SysSleep(100);
         }
         res=JobResult;
     }    

     if (Check(res,"Async (callback) Block Upload (SDB 0)"))
     {
          printf("Dump (%d bytes) :\n",Size);
          hexdump(&Buffer,Size);
     }
}
//------------------------------------------------------------------------------
// Async Upload DB0 (using event wait as completion trigger)
//------------------------------------------------------------------------------
void AsEWUploadDB0()
{
     int Size = sizeof(Buffer); // Size is IN/OUT par
                                // In input it tells the client the size available
                                // In output it tells us how many bytes were uploaded.
     JobDone=false;
     int res=Client->AsUpload(Block_SDB, 0, &Buffer, &Size);
     
     if (res==0)
     {
         res=Client->WaitAsCompletion(3000);
     }    

     if (Check(res,"Async (Wait event) Block Upload (SDB 0)"))
     {
          printf("Dump (%d bytes) :\n",Size);
          hexdump(&Buffer,Size);
     }
}
//------------------------------------------------------------------------------
// Async Upload DB0 (using polling as completion trigger)
//------------------------------------------------------------------------------
void AsPOUploadDB0()
{
     int Size = sizeof(Buffer); // Size is IN/OUT par
                                // In input it tells the client the size available
                                // In output it tells us how many bytes were uploaded.
     JobDone=false;
     int res=Client->AsUpload(Block_SDB, 0, &Buffer, &Size);
     
     if (res==0)
     {
         while (!Client->CheckAsCompletion(&res))
         {
             SysSleep(100);
         };         
     }    

     if (Check(res,"Async (polling) Block Upload (SDB 0)"))
     {
          printf("Dump (%d bytes) :\n",Size);
          hexdump(&Buffer,Size);
     }
}
//------------------------------------------------------------------------------
// Read a sample SZL Block
//------------------------------------------------------------------------------
void ReadSzl_0011_0000()
{
     PS7SZL SZL = PS7SZL(&Buffer);  // use our buffer casted as TS7SZL
     int Size = sizeof(Buffer);
     // Block ID 0x0011 IDX 0x0000 normally exists in every CPU
     int res=Client->ReadSZL(0x0011, 0x0000, SZL, &Size);
     if (Check(res,"Read SZL - ID : 0x0011, IDX 0x0000"))
     {
        printf("  LENTHDR : %d\n",SZL->Header.LENTHDR);
        printf("  N_DR    : %d\n",SZL->Header.N_DR);
        printf("Dump (%d bytes) :\n",Size);
        hexdump(&Buffer,Size);
     }
}
//------------------------------------------------------------------------------
// Unit Connection
//------------------------------------------------------------------------------
bool CliConnect()
{
    Client->SetConnectionType(3);
    int res = Client->ConnectTo(Address,Rack,Slot);
    if (Check(res,"UNIT Connection")) {
          printf("  Connected to   : %s (Rack=%d, Slot=%d)\n",Address,Rack,Slot);
          printf("  PDU Requested  : %d bytes\n",Client->PDURequested());
          printf("  PDU Negotiated : %d bytes\n",Client->PDULength());
    };
    return res==0;
}
//------------------------------------------------------------------------------
// Unit Disconnection
//------------------------------------------------------------------------------
void CliDisconnect()
{
     Client->Disconnect();
}
//------------------------------------------------------------------------------
// Perform readonly tests, no cpu status modification
//------------------------------------------------------------------------------
void PerformTests()
{
     OrderCode();
     CpuInfo();
     CpInfo();
     UnitStatus();
     ReadSzl_0011_0000();
     UploadDB0();
     AsCBUploadDB0();
     AsEWUploadDB0();
     AsPOUploadDB0();
     MultiRead();
}
//------------------------------------------------------------------------------
// Tests Summary
//------------------------------------------------------------------------------
void Summary()
{
    printf("\n");
    printf("+-----------------------------------------------------\n");
    printf("| Test Summary \n");
    printf("+-----------------------------------------------------\n");
    printf("| Performed : %d\n",(ok+ko));
    printf("| Passed    : %d\n",ok);
    printf("| Failed    : %d\n",ko);
    printf("+----------------------------------------[press a key]\n");
    getchar();
}

float GetPLCData(){
    float value0 = 0;
    byte value1[4]= {0};
    Client->DBRead(1,1244,4,value1);
    *((byte*)&value0 + 0) = value1[3];
    *((byte*)&value0 + 1) = value1[2];
    *((byte*)&value0 + 2) = value1[1];
    *((byte*)&value0 + 3) = value1[0];
    
    
    return value0;
}

//------------------------------------------------------------------------------
// Main              
//------------------------------------------------------------------------------
float s7_main()
{
        float result = 0;
        
        Client = new TS7Client();
        Client->SetConnectionType(3);
        Client->ConnectTo("192.168.1.2", 0, 1); //PLC的IP地址，机架号，插槽号
        
        
        OH_LOG_Print(LOG_APP, LOG_INFO, 0xFF00, "PluginManager", "[S7 CONNECT]Connected");
        
        if(Client->Connected() == true){
            OH_LOG_Print(LOG_APP, LOG_INFO, 0xFF00, "PluginManager", "[S7 CONNECT]连接成功");
        }
        
        float value0 = 0;
        byte value1[4]= {0};
        Client->DBRead(1,1111,4,value1);
        *((byte*)&value0 + 0) = value1[3];
        *((byte*)&value0 + 1) = value1[2];
        *((byte*)&value0 + 2) = value1[1];
        *((byte*)&value0 + 3) = value1[0];
    
        result = value0;
        
        
        
        delete Client;
    
        return result;
}